1、BRITISH STANDARD BS 6579-3: 1988 Safety fences and barriers for highways Part 3: Specification for components for tensioned rectangular hollow section beam (100mm 100mm) safety fence UDC 625.738 + 692.88BS6579-3:1988 This British Standard, having been prepared under the directionof the Road Engineer
2、ingStandards Committee, was published underthe authority of the BoardofBSI and comes intoeffecton 30 September 1988 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference RDB/18 Draft for comment 86/13656 DC ISBN 0 580 16438 1 Committees responsible for thi
3、s British Standard The preparation of this British Standard was entrusted by the Road Engineering Standards Committee (RDB/-) to Technical Committee RDB/18, upon which the following bodies were represented: Aluminium Federation Association of Consulting Engineers British Railways Board British Steel
4、 Industry Cement and Concrete Association Convention of Scottish Local Authorities County Surveyors Society Department of Transport (Highways) Institution of British Engineers Institution of Civil Engineers Institution of Highways and Transportation Royal Automobile Club Royal Society for the Preven
5、tion of Accidents The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Department of Transport (Transport and Road Research Laboratory) Fencing Contractors Association Amendments issued since publication Amd. No. Date of issue CommentsBS6579-3
6、:1988 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 0 Introduction 1 1 Scope 1 2 Definitions 2 3 Components 2 4 Tolerances 3 5 Protective finish 3 6 Marking 3 Appendix A Vehicle safety fences and barriers for highways: type characteristics 4 Appendix B Transition
7、between safety fences, bridge parapets and other types of safety fence 6 Appendix C Schedule of components 6 Appendix D Transport, handling and storage 8 Appendix E Information to be supplied 8 Figure 1 General arrangement of rectangular hollow section beam (100 mm 100 mm) safety fence, type TRHS1 9
8、 Figure 2 Details of safety fence posts 10 Figure 3 Expansion joint anchorages 11 Figure 4 Details of beams, connector plates and turn-buckles 12 Figure 5 Diagrammatical representation of fences and barriers 13 Table 1 Vehicle safety fences and barriers for highways: type characteristics 4 Table 2 C
9、omponents for 1km of fence 6 Publications referred to Inside back coverBS6579-3:1988 ii BSI 07-1999 Foreword This Part of BS6579 has been prepared under the direction of the Road Engineering Standards Committee. The other Parts of BS6579 either published or in preparation are: Part 1: Specification
10、for components for tensioned corrugated beam safety fence on Z posts; Part 2: Specification for tensioned corrugated beam safety fence on offset brackets; Part 4: Specification for tensioned rectangular hollow section beam (200mm 100mm) safety fence; Part 5: Specification for open box beam safety fe
11、nce (single height); Part 6: Specification for components for open box beam safety fence (doubleheight); Part 7: Specification for untensioned corrugated beam safety fences; Part 8: Specification for concrete safety barriers. Appendix A and Appendix B provide additional information helpful to the us
12、ers of the components. BS6579 is being produced at the request of users and manufacturers in order to cover the various types of safety fences and barriers available. Fences detailed in Parts1 to 7 have been developed already and approved for use on roads in the United Kingdom. The designs are based
13、 on the results of static and dynamic tests carried out in the past on components and complete systems under the direction of the Transport and Road Research Laboratory (TRRL). The safety barrier detailed in Part8 is for use only on certain roads at the date of publication of this British Standard.
14、If further types are developed, BS6579 will be revised and increased in scope to cover additions and variations. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Brit
15、ish Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments
16、incorporated. This will be indicated in the amendment table on the inside front cover.BS6579-3:1988 BSI 07-1999 1 0 Introduction 0.1 The objective of providing safety fences or barriers adjacent to a highway is to reduce the consequences of vehicles leaving the carriageway and entering areas where i
17、t would be unsafe for them to travel. Safety fences are intended to absorb some of the energy of impact and to redirect the errant vehicle, so that it follows, within a narrow angle, the line of the fence in the direction of the traffic and does not overturn. Safety barriers are intended to provide
18、containment without significant deflection or deformation under impact, and to redirect errant vehicles along the line of the barrier in the direction of traffic. 0.2 The safety fences and barriers for ground mounting which are the subject of BS6579 are for use in conjunction with parapets on bridge
19、s and other structures, which are the subject of BS6779. Although definitions in both standards have been chosen so as to align as closely as possible, there are some cases where a definition is applicable only to a particular Part of BS6579 and does not apply generally. 0.3 No direct guidance is gi
20、ven in BS6579 on the situations where safety fences and barriers should be erected or on the choice of the types described in the various Parts, but information pertaining to general characteristics of different types of safety fences and barriers is given inAppendix A. 0.4 There are various situati
21、ons and various methods by which transition between a safety fence or safety barrier and a bridge parapet can be assured without impairing the overall protection afforded to users of the highway. Appendix B gives recommendations on the method of connecting rectangular hollow section beam(100mm 100mm
22、) safety fences to bridge parapets and other types of safety fence. 0.5 It is important to recognize that the performance of a safety fence can be affected by factors that are not covered by the specifications for the components. These factors include the choice of intermediate posts to suit the gro
23、und conditions and the erection and maintenance of the fence. Tensioned fences are not complete until all tensioning procedures have been satisfactorily completed. 0.6 Figure 1 illustrates the general arrangement ofa tensioned rectangular hollow section beam(100mm 100mm) safety fence for which the c
24、omponents specified in this Part of BS6579 are intended. It is essential that the end posts and all angled beam posts are set in concrete as illustrated in Figure 1. Intermediate posts (seeFigure 1 and Figure 2), however, are either driven securely, or set in concrete, into the ground or mounted on
25、bridge decks using “bridge deck posts”. Where a tensioned rectangular hollow section beam fence is not continued over a bridge, the full height anchorages shown in Figure 3 should be used. These should be set in concrete and located adjacent to the approach and departure ends of the bridge deck. 0.7
26、 Enquiries concerning the availability of detailed drawings providing information on manufacture and installation should be made to the Department of Transport Head-quarters 1)or Regional Offices of the Department. 0.8 Where a tensioned rectangular hollow section beam safety fence is used on a curve
27、 the limiting radius of the installation should be not less than120m. 0.9 The approach to the safety fence should be set back away from the traffic and flared. The flare length should be at least ten times the set back. 0.10 Appendix C gives the number of components for 1km of safety fence. 0.11 App
28、endix D gives important recommendations on the transport, handling and storage of components prior to assembly on site. 0.12 Appendix E lists information that should be provided when making an enquiry or order. 0.13 If for any reason the height of the safety fence above the adjacent carriageway is a
29、ffected by the raising of the running surface, action should be taken to restore the height of the safety fence to the specified dimension. 1 Scope This Part of BS6579 specifies requirements for thecomponents to be used in the construction of thetensioned rectangular hollow section beam(100mm 100mm)
30、 safety fence, type TRHS1, supported on Z posts. Requirements are given for materials, dimensions, protective finishes and identification. 1) Department of Transport, EPP Division, St Christopher House, Southwark Street, London SE1 OTE.BS6579-3:1988 2 BSI 07-1999 This Part of BS6579 does not cover e
31、rection and tensioning of the assembled fence (see clause0). This Part of BS6579 does not cover the useofrectangular hollow section beam(100mm 100mm) safety fence for radii less than 120m. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definiti
32、ons For the purposes of this Part of BS6579 the following definitions apply. 2.1 safety fence an installation provided for the protection of users of the highway consisting of horizontal beams mounted on posts 2.2 safety barrier an installation provided for the protection of users of the highway whi
33、ch is continuously in contact with its supporting foundation 2.3 single sided safety fence a safety fence having its beams on the side of the mounting posts nearest to the traffic 2.4 double sided safety fence a safety fence having the traffic face of its beams in front of, or in line with, the traf
34、fic faces of the supporting posts, with the traffic approaching on both sides 2.5 traffic face the face of the safety fence or barrier that is nearer to the vehicular traffic flow 2.6 impacting vehicle a vehicle striking a safety fence or barrier whether or not it is redirected 2.7 terminal that end
35、-section of the length of a safety fence within which the beam rises from or is brought down to an anchorage 2.8 flaring (of the ends) the setting back of ground anchorages behind the line of a safety fence NOTEFlaring is intended to reduce the risk of errant vehicles hitting or mounting the anchora
36、ges and to reduce the risk of a vehicle passing behind the safety fence. 2.9 full height anchorage a cross-braced frame extending to the full height of a safety fence NOTEFull height anchorages are used in locations where ground anchorages are not suitable. 2.10 initial installation length the lengt
37、h of safety fence, obtained by setting out the position of each intermediate post from the centre of the angled beam post (the datum), when lap bolt clearances have been taken up but before beam to post connections are tightened 2.11 adjuster assembly a device for tensioning safety fences and adjust
38、ing the verticality of end posts 3 Components 3.1 Beams (seeFigure 4) Beams shall be formed from 100mm 100mm 5mm hot rolled rectangular hollow sections that have dimensions complying with BS4848-2 and that have physical properties complying with grade50C of BS4360. 3.2 Posts and anchorages 3.2.1 Pos
39、ts and anchorages shall be made from steel complying with the following grades of BS4360: a) anchor posts: sections grade 43C, plates grade43A; b) end posts: sections grade 43C, plates 43A; c) other posts: grade 43A; d) full height anchorages: hollow sections grade43C, plates and other sections grad
40、e 43A. 3.2.2 Posts and anchorages shall have dimensions as shown inFigure 2 andFigure 3 respectively, and shall comply with the following specifications: a) rectangular hollow sections: BS4848-2; b) angle sections: BS4848-4; c) channel sections: BS4. 3.3 Adjuster turn-buckles and nuts Adjuster turn-
41、buckles and nuts shall be made from steel complying with grade 080M40 of BS970-1 and shall have dimensions as given inFigure 4. 3.4 Connections 3.4.1 Connecting plates. Connecting plates shall be made from steel complying with grade 43A of BS4360 and shall have dimensions as shown inFigure 4.BS6579-
42、3:1988 BSI 07-1999 3 3.4.2 Connector covers. Connector covers shall be made from hot rolled rectangular hollow section that has dimensions complying with BS4848-2 and as given inFigure 4, and that has physical properties complying with grade 43C of BS4360. 3.4.3 Fasteners. Bolts, nuts and washers sh
43、all be made from steel and selected from the following as appropriate. a) Bolts and screws shall be ISO metric black hexagon type either complying with grade 4.6 of BS4190 or as specified inAppendix C. b) Nuts shall be ISO metric black hexagon nuts either complying with grade 4 of BS4190 or as speci
44、fied inAppendix C. c) Washers shall be black complying with BS4320, form E as in Appendix C. NOTEThe items listed in a), b) and c) are to be galvanized before use (see clause5). 3.5 Reinforcing rings and tie bars Reinforcement for use in concrete foundations shall be made from 10mm diameter steel ro
45、d complying with grade 250 of BS4449. 4 Tolerances 4.1 Tolerances on dimensions of components shall be in accordance with the appropriate dimensional specification, detailed drawings and relevant figures of this Part of BS6579. 4.2 Deviation from the specified dimensions for materials and fabricated
46、 components shall be measured before galvanizing. 5 Protective finish All steel components, excluding reinforcing rings and reinforcing bars, shall be hot dip galvanized, in accordance with BS729, after fabrication. Fasteners shall be spun galvanized. NOTEWhere the purchaser wishes the components to
47、 be further protected by a paint system such requirements should be specified at the time of the enquiry and/or order. In this respect attention is drawn to BS5493. 6 Marking All beams, connectors, posts and anchorages shall be clearly marked with the following: a) the number of this British Standar
48、d, i.e. BS6579 2) ; b) the manufacturers identification mark; c) digits indicating the month and year of manufacture. (Note for example 10/88 indicates manufacture during October1988.) 2) Marking BS6579 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim
49、 by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable.BS 6579-3:1988 4 BSI 07-1999 Appendix A Vehicle safety fences and barriers for highways: type characteristics Information on type characteristics is given in Table 1. Illustrations of fence and barrier types are given in Figure 5.
